Best for Stress, anxiety, and sleep-related research
Online discussions often describe Selank, Semax, and DSIP as established solutions for anxiety, focus, or sleep. The source record is much narrower: Russian regulatory use and publications for Selank and Semax, plus older mixed sleep studies for DSIP. This page ranks evidence depth and replication, not popularity.
Selank
The most directly anxiety-oriented compound in this group, with Russian pharmaceutical use and published mechanistic literature but little independent replication.
Evidence level: Limited clinical use and peer Reviewed mechanistic research; weak independent replication
Regulatory status: Registered in Russia; not FDA-approved
Selank is a tuftsin-derived peptide registered in Russia for anxiety-related use. Publications discuss GABA-related mechanisms, immune signaling, and functional-connectivity findings, but much of the evidence comes from Russian research groups and lacks large independent clinical replication.
Sedative-Hypnotic Agents That Impact Gamma-Aminobutyric Acid Receptors: Focus on Flunitrazepam, Gamma-Hydroxybutyric Acid, Phenibut, and Selank.
pubmed-selank-gaba-review-2021Functional Connectomic Approach to Studying Selank and Semax Effects.
pubmed-selank-functional-connectomics-2020Selank, a Peptide Analog of Tuftsin, Attenuates Aversive Signs of Morphine Withdrawal in Rats.
pubmed-selank-morphine-withdrawal-2022Semax
A Russian-registered peptide discussed for attention and stress resilience, with a larger cognitive framing than direct anxiety evidence.
Evidence level: Russian clinical publications and preclinical research
Regulatory status: Registered in Russia; not FDA-approved and under regulatory watch
Semax is an ACTH-derived peptide registered in Russia. Russian-language publications describe cognitive and attention effects, while experimental studies compare its neural-network effects with Selank. Independent Western clinical replication is lacking.
Russian-language clinical and preclinical publications on Semax (a heptapeptide ACTH analog) describing cognitive and attention-enhancing effects. Studies are primarily from Russian institutions and lack independent Western replication.
pubmed-semax-cognitive-2006Functional Connectomic Approach to Studying Selank and Semax Effects.
pubmed-selank-functional-connectomics-2020FDA Pharmacy Compounding Advisory Committee meeting notice for July 23 to 24, 2026, scheduling peptide bulk substances for discussion.
fda-pcac-july-2026DSIP
Directly associated with sleep research, but supported mainly by older small studies with mixed and inconclusive findings.
Evidence level: Older limited clinical studies and preclinical research
Regulatory status: Not FDA-approved; regulatory watch
Delta sleep-inducing peptide was studied in early human and animal sleep research. Historical studies reported variable effects, and modern clinical evidence has not established a reliable sleep treatment benefit.
Clinical studies of delta sleep-inducing peptide (DSIP) in human sleep, dating to the 1970s-1980s, with mixed and inconclusive results. The DSIP clinical literature is old and has not been advanced with modern trials.
pubmed-dsip-clinical-sleep-1984Reviews of DSIP pharmacology describe it as a nonapeptide isolated from rabbit brain extract with reported sleep-modulating activity, though clinical significance remains unestablished.
pubmed-dsip-pharmacology-reviewFDA Pharmacy Compounding Advisory Committee meeting notice for July 23 to 24, 2026, scheduling peptide bulk substances for discussion.
fda-pcac-july-2026None of these peptides is FDA-approved for anxiety, stress, or sleep treatment in the United States. Russian registration and small historical studies do not establish general efficacy or safety.
Source records are stored in the repo and linked from this page.
Sedative-Hypnotic Agents That Impact Gamma-Aminobutyric Acid Receptors: Focus on Flunitrazepam, Gamma-Hydroxybutyric Acid, Phenibut, and Selank.
pubmed-selank-gaba-review-2021Functional Connectomic Approach to Studying Selank and Semax Effects.
pubmed-selank-functional-connectomics-2020Selank, a Peptide Analog of Tuftsin, Attenuates Aversive Signs of Morphine Withdrawal in Rats.
pubmed-selank-morphine-withdrawal-2022Russian-language clinical and preclinical publications on Semax (a heptapeptide ACTH analog) describing cognitive and attention-enhancing effects. Studies are primarily from Russian institutions and lack independent Western replication.
pubmed-semax-cognitive-2006Clinical studies of delta sleep-inducing peptide (DSIP) in human sleep, dating to the 1970s-1980s, with mixed and inconclusive results. The DSIP clinical literature is old and has not been advanced with modern trials.
pubmed-dsip-clinical-sleep-1984Reviews of DSIP pharmacology describe it as a nonapeptide isolated from rabbit brain extract with reported sleep-modulating activity, though clinical significance remains unestablished.
pubmed-dsip-pharmacology-reviewFDA Pharmacy Compounding Advisory Committee meeting notice for July 23 to 24, 2026, scheduling peptide bulk substances for discussion.
fda-pcac-july-2026